runtime/Protocol.m

   1 /*
   2  * Copyright (c) 1999-2001, 2005-2007 Apple Inc.  All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24         Protocol.h
  25         Copyright 1991-1996 NeXT Software, Inc.
  26 */
  27
  28
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <mach-o/dyld.h>
  32 #include <mach-o/ldsyms.h>
  33
  34 #define OLD 1
  35 #import "objc-private.h"
  36 #import "Protocol.h"
  37
  38
  39 /* some forward declarations */
  40
  41 #if !__OBJC2__
  42 __private_extern__ struct objc_method_description * lookup_protocol_method(Protocol *proto, SEL aSel, BOOL isRequiredMethod, BOOL isInstanceMethod);
  43 #else
  44 __private_extern__ Method _protocol_getMethod(Protocol *p, SEL sel, BOOL isRequiredMethod, BOOL isInstanceMethod);
  45 #endif
  46
  47
  48 @implementation Protocol
  49
  50 #if __OBJC2__
  51 // fixme hack - make Protocol a non-lazy class
  52 + (void) load { }
  53 #endif
  54
  55
  56 typedef struct {
  57     uintptr_t count;
  58     Protocol *list[0];
  59 } protocol_list_t;
  60
  61 - (BOOL) conformsTo: (Protocol *)aProtocolObj
  62 {
  63     return protocol_conformsToProtocol(self, aProtocolObj);
  64 }
  65
  66 - (struct objc_method_description *) descriptionForInstanceMethod:(SEL)aSel
  67 {
  68 #if !__OBJC2__
  69     return lookup_protocol_method(self,aSel, YES/*required*/, YES/*instance*/);
  70 #else
  71     return method_getDescription(_protocol_getMethod(self, aSel, YES, YES));
  72 #endif
  73 }
  74
  75 - (struct objc_method_description *) descriptionForClassMethod:(SEL)aSel
  76 {
  77 #if !__OBJC2__
  78     return lookup_protocol_method(self, aSel, YES/*required*/, NO/*instance*/);
  79 #else
  80     return method_getDescription(_protocol_getMethod(self, aSel, YES, NO));
  81 #endif
  82 }
  83
  84 - (const char *)name
  85 {
  86     return protocol_getName(self);
  87 }
  88
  89 - (BOOL)isEqual:other
  90 {
  91 #if __OBJC2__
  92     // check isKindOf:
  93     Class cls;
  94     Class protoClass = objc_getClass("Protocol");
  95     for (cls = other->isa; cls; cls = class_getSuperclass(cls)) {
  96         if (cls == protoClass) break;
  97     }
  98     if (!cls) return NO;
  99     // check equality
 100     return protocol_isEqual(self, other);
 101 #else
 102     return [other isKindOf:[Protocol class]] && [self conformsTo: other] && [other conformsTo: self];
 103 #endif
 104 }
 105
 106 - (unsigned int)hash
 107 {
 108     return 23;
 109 }
 110
 111 @end